The point is that there's a difference in the environment.
Would you go "holy hell, you have a problem" when someone is high strung, and expect it to go down well in person?
Would you suggest to someone that they have a problem to the point of needing professional care, when they lose their cool for the first time in over a year? And that one outburst is your entire context?
There is literally nothing unusual about getting angry.
The only abnormal factor here is how people online react to someone when that happens, and dare to express it.
How is encouraging you to share how the behaviour of others affects you, an argument against pointing out bad behaviour?
What I said was, is that you don't get to tell others how their behaviour affects them, only how it affects you.
"That makes me feel bad" instead of "That can't be making you feel good". The first one you can know is true, on the second, you are always guessing.
The thought of taking a powerdrill to mine, ghetto gaming mouse weight reduction style, has crossed my mind many times.